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Oscillating boundary condition

Posted 8 déc. 2012, 04:04 UTC−5 Computational Fluid Dynamics (CFD), Geometry, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.0, Version 4.2 2 Replies

Saurabh Bhandari
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Hi,

How can we impose oscillating boundary condition in terms of velocity, on a boundary of a defined geometry.

Thanks in advance
Saurabh
2 Replies Last Post 12 déc. 2012, 02:37 UTC−5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 9 déc. 2012, 05:53 UTC−5
Hi

most if not all BC accept not only a scalar value, but a full field expression depending on both spatial x,y,z or tempral "t" dimensions.

So either you physics is designed for time solveing and you can write out Amplitude*sin(2*pi*freq*t), or you are in a steady state case and you use the simpler and quicler to solve harmonic development of the frequency domain solvers and you express amplitudes in your BC (and possibly physe lag via a complx phasor expression) and you define your frequencyor frequency span (series of) in the frequency domain solver node

--
Good luck
Ivar
Hi most if not all BC accept not only a scalar value, but a full field expression depending on both spatial x,y,z or tempral "t" dimensions. So either you physics is designed for time solveing and you can write out Amplitude*sin(2*pi*freq*t), or you are in a steady state case and you use the simpler and quicler to solve harmonic development of the frequency domain solvers and you express amplitudes in your BC (and possibly physe lag via a complx phasor expression) and you define your frequencyor frequency span (series of) in the frequency domain solver node -- Good luck Ivar
Saurabh Bhandari
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Posted: 1 decade ago 12 déc. 2012, 02:37 UTC−5
Thanks Ivar for your suggestions
Thanks Ivar for your suggestions

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